Due to the way they specifically work, hydraulic truck cranes are different compared to other crane models. Instead of using a winch in order to wind up cables to provide the lifting force, hydraulic cranes utilize oil instead. As oil is a type of fluid which retains its volume, it is incompressible. Thus, this means it is among the most ideal types of fluids for pushing pistons towards the direction the force is going to be exerted.
The pressure created by the hydraulic pump moves the piston. This particular action is maneuvered by the driver from the controls in his cab. Normally, hydraulic truck cranes use a pump which has 2 gears.
As the actual crane itself is mounted on a truck, it can travel numerous distances from job to job and there is little dismantling involved. The truck crane has a single engine which can control both the truck and the crane.
Other Components
Boom Telescope: The boom telescope is due to a particular hydraulic operation which allows the boom to retract or extend.
Jib: The jib is a latticed structure that extends from the boom.
Boom Swing: Boom swings have a large ball or roller attached to the carrier. It is able to swing 360 degrees in both directions. Hydraulic devices provide swings at varying speeds and control the swing in order to rotate the turntable gearbox.
Outrigger: Outriggers are units which cranes would utilize to maintain its balance. It utilizes hydraulics to lift the truck.
Load Movement Indicator: In order to warn the driver that maximum weight is approaching, the load movement indicator's lights flash.
Pump: The pump is the mechanism responsible for steering the outrigger.
Steel Cables: Steel reinforced cables run through the boom and the jib. They can generate up to 6350 kg or 14,000 lbs.
Boom Elevation: The crane's boom ascends using double hydraulic cylinders which allow for lowering and raising materials.
Rotex Gear: The rotex gear is situated beneath the cab and operated by hydraulics. It allows the boom to swivel on this gear.